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dev_sqlite:
  adapter: sqlite3
  database: db/development.sqlite3
  pool: 5
  timeout: 5000

# in your shell
./script/server -p 3001 -e dev_sqlite

# you should see the same in localhost:3001

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# add the rvm_info_for_prompt into your prompt
# below is my full prompt
PS1='%{$fg[white]%}%n%{$fg[cyan]%}:%{$fg_no_bold[yellow]%}%3~%{$fg_no_bold[green]%}$(git_info_for_prompt)%{$fg_no_bold[magenta]%}$(rvm_info_for_prompt)%{$reset_color%}# '

# this tests for the presence of rvm 
# if its loaded, it'll add the prompt
function rvm_info_for_prompt {
  ruby_version=$(~/.rvm/bin/rvm-prompt)
  if [ -n "$ruby_version" ]; then
    echo "[$ruby_version]"

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<% semantic_form_for @post do |form| %>
  <%= form.inputs :title, :body %>
<% end %>

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class Car < ActiveRecord::Base
  composed_of :tyre, :class_name => "Tyre", :mapping => %w(air_pressure wear_and_tear)
  composed_of :steering_wheel, :class_name => "SteeringWheel", :mapping => %w(horn) 
end

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class Child < ActiveRecord::Base
  belongs_to              :parent
  has_one                 :dog
  has_many                :toys
  has_and_belongs_to_many :schools
end

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class Child < ActiveRecord::Base
  belongs_to :parent
end

# rails console
>> Child.reflect_on_all_associations
Child.reflect_on_all_associations
=> [#<ActiveRecord::Reflection::AssociationReflection:0xb4828958 
   @options={}, 
   @collection=false,

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# rails console
>> Child.reflect_on_association(:parent)
Child.reflect_on_association(:parent)
=> #<ActiveRecord::Reflection::AssociationReflection:0xb4828958 
   @options={}, 
   @collection=false,
   @name=:parent,
   @active_record=Child(id: integer, name: string, parent_id: integer),
   @macro=:belongs_to>

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class SoccerTeam < ActiveRecord::Base
  has_many :players
end

class Player < ActiveRecord::Base
  belongs_to :soccer_team
end

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# formtastic forms
<% semantic_form_for @soccer_team do |form| %>
  <%= form.input :player %>
<% end %>

# the Rails equivalent:
<% form_for @soccer_team do |form| %>  
  <%= f.select :player, Player.all.collect { |c| c.name, c.id } %>
<% end %>

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# lib/formtastic.rb
def select_input(method, options)
  ...  
  collection = find_collection_for_column(method, options)
  self.select(input_name, collection, strip_formtastic_options(options), html_options)
  ...
end